RtfFilter::filter: don't leak pIn
RtfFilter::filter: don't leak pIn

Change-Id: I2510cd7faa48c0287498bdbc2511e29dbc62860a

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core